# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a296130 Showing 1-1 of 1 %I A296130 #16 Feb 27 2020 23:11:50 %S A296130 18,27,36,45,54,63,72,81,90,1089,1098,1188,1278,1287,1368,1386,1458, %T A296130 1485,1548,1584,1638,1683,1728,1782,1809,1818,1827,1836,1845,1854, %U A296130 1863,1872,1881,1890,1908,1980,2079,2097,2178,2187,2277,2367,2376,2457,2475,2547,2574,2637,2673,2709,2718 %N A296130 Replace each digit of n with its complement to 9; this will reproduce all digits of n in a different order. %C A296130 The complement of 0 is 9, of 1 is 8, of 2 is 7, etc. All terms of the sequence have an even number of digits, and all terms are divisible by 9. %H A296130 Jean-Marc Falcoz, Table of n, a(n) for n = 1..3000 %e A296130 18 produces 81 when 1 is replaced by 8 and 8 is replaced by 1; 18 and 81 use the same set of digits, in a different order. %e A296130 1089 produces 8910 when 1 is replaced by 8, 0 by 9, 8 by 1 and 9 by 0; 1089 and 8910 use the same set of digits, in a different order. %o A296130 (PARI) replace_digits(n) = my(d=digits(n)); for(k=1, #d, d[k]=abs(d[k]-9)); d %o A296130 is(n) = vecsort(digits(n))==vecsort(replace_digits(n)) \\ _Felix Fröhlich_, Feb 14 2018 %Y A296130 Cf. A061601. %K A296130 nonn,base %O A296130 1,1 %A A296130 _Eric Angelini_ and _Jean-Marc Falcoz_, Feb 14 2018 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE